/* ============================================
   BUCH-REZENSIONS-PWA - Barrierefreies Design v2.0
   MIT BOOK-READER & FEHLER-MARKIERUNG STYLES
   ============================================ */

/* ============================================
   CSS VARIABLES - LIGHT MODE
   ============================================ */
:root,
[data-theme="light"] {
    --base-font-size: clamp(20px, 5vw, 32px);
    --large-font-size: clamp(24px, 6vw, 40px);
    --extra-large-font-size: clamp(28px, 8vw, 48px);
    
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-card: #ffffff;
    --text-primary: #1a1a2a;
    --text-secondary: #444444;
    --accent-color: #c0392b;
    --accent-hover: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --border-color: #dddddd;
    
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.15);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    --touch-min: 64px;
    
    /* Error marking colors */
    --error-critical-bg: rgba(231, 76, 60, 0.15);
    --error-critical-border: #e74c3c;
    --error-english-bg: rgba(243, 156, 18, 0.15);
    --error-english-border: #f39c12;
    --error-spanish-bg: rgba(52, 152, 219, 0.15);
    --error-spanish-border: #3498db;
    --mark-note-bg: rgba(155, 89, 182, 0.15);
    --mark-note-border: #9b59b6;
    --mark-good-bg: rgba(39, 174, 96, 0.15);
    --mark-good-border: #27ae60;
}

/* DARK MODE */
[data-theme="dark"] {
    --base-font-size: clamp(20px, 5vw, 32px);
    --large-font-size: clamp(24px, 6vw, 40px);
    --extra-large-font-size: clamp(28px, 8vw, 48px);
    
    --bg-primary: #0d0d1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --accent-color: #e94560;
    --accent-hover: #ff6b81;
    --success-color: #4ecca3;
    --warning-color: #f39c12;
    --border-color: #3a3a5a;
    
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    
    --error-critical-bg: rgba(231, 76, 60, 0.25);
    --error-critical-border: #ff6b6b;
    --error-english-bg: rgba(243, 156, 18, 0.25);
    --error-english-border: #ffd93d;
    --error-spanish-bg: rgba(52, 152, 219, 0.25);
    --error-spanish-border: #74b9ff;
    --mark-note-bg: rgba(155, 89, 182, 0.25);
    --mark-note-border: #a29bfe;
    --mark-good-bg: rgba(39, 174, 96, 0.25);
    --mark-good-border: #55efc4;
}

/* RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: var(--base-font-size); scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary); color: var(--text-primary);
    line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column;
}
.hidden { display: none !important; }

/* ============================================
   HEADER
   ============================================ */
.header {
    background: var(--bg-secondary); padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100;
}
.header-top { display: flex; justify-content: space-between; align-items: center; gap: var(--spacing-sm); }
.header h1 { font-size: var(--large-font-size); color: var(--text-primary); }
.header-actions { display: flex; gap: var(--spacing-xs); align-items: center; position: relative; }
.subtitle { color: var(--text-secondary); margin-top: var(--spacing-xs); font-size: 0.9em; }

.theme-toggle {
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-sm); padding: 0.5em 0.75em; cursor: pointer;
    font-size: 1.1em; min-width: var(--touch-min); transition: transform 0.2s;
}
.theme-toggle:hover { transform: scale(1.05); }
.theme-toggle:active { transform: scale(0.95); }

.badge {
    position: absolute; top: -8px; right: -8px;
    background: var(--accent-color); color: white;
    font-size: 0.6em; padding: 2px 6px; border-radius: 10px;
    font-weight: bold;
}

.zoom-controls { display: flex; align-items: center; gap: var(--spacing-sm); margin-top: var(--spacing-sm); }
.zoom-controls button {
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-sm); padding: 0.3em 0.6em; cursor: pointer;
    font-size: 0.9em;
}

.progress-container { margin-top: var(--spacing-sm); }
.progress-info { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-xs); }
.progress-btn-small {
    background: var(--accent-color); color: white; border: none;
    padding: 0.3em 0.8em; border-radius: var(--radius-sm); cursor: pointer; font-size: 0.7em;
}
.progress-bar { height: 8px; background: var(--border-color); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent-color), var(--success-color)); width: 0%; transition: width 0.3s; }

/* ============================================
   READER HEADER
   ============================================ */
.reader-header {
    background: var(--bg-secondary); padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 2px solid var(--accent-color); position: sticky; top: 0; z-index: 100;
}
.reader-header-top { display: flex; justify-content: space-between; align-items: center; gap: var(--spacing-sm); }
.reader-header h2 { font-size: 1.1em; flex: 1; text-align: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.back-btn, .toc-btn {
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-sm); padding: 0.4em 0.8em; cursor: pointer;
    font-size: 0.85em; white-space: nowrap;
}
.chapter-nav {
    display: flex; align-items: center; gap: var(--spacing-sm); margin-top: var(--spacing-xs);
    flex-wrap: wrap;
}
.chapter-nav select {
    flex: 1; min-width: 150px; padding: 0.5em;
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-sm); color: var(--text-primary); font-size: 0.85em;
}
.nav-arrow {
    background: var(--accent-color); color: white; border: none;
    padding: 0.4em 0.8em; border-radius: var(--radius-sm); cursor: pointer; font-size: 0.75em;
}
.reader-progress { margin-top: var(--spacing-xs); font-size: 0.75em; color: var(--text-secondary); }
.mini-progress-bar { height: 4px; background: var(--border-color); border-radius: 2px; margin-top: 4px; }
.mini-progress-fill { height: 100%; background: var(--accent-color); width: 0%; transition: width 0.2s; }

/* ============================================
   NAVIGATION
   ============================================ */
.main-nav {
    display: flex; gap: 0; background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color); position: sticky; top: auto; z-index: 90;
}
.nav-btn {
    flex: 1; padding: var(--spacing-sm); background: transparent;
    border: none; border-bottom: 3px solid transparent;
    color: var(--text-secondary); font-size: 0.9em; cursor: pointer;
    transition: all 0.2s; min-height: var(--touch-min);
}
.nav-btn.active { color: var(--accent-color); border-bottom-color: var(--accent-color); background: var(--bg-card); }
.nav-btn:hover:not(.active) { background: var(--bg-secondary); }

/* ============================================
   SECTIONS
   ============================================ */
.section { display: none; padding: var(--spacing-md); flex: 1; max-width: 900px; margin: 0 auto; width: 100%; }
.section.active { display: block; }
.section h2 { font-size: var(--large-font-size); margin-bottom: var(--spacing-md); color: var(--text-primary); }

/* ============================================
   BOOK CARDS
   ============================================ */
.book-card {
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-lg); padding: var(--spacing-md); margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm); cursor: pointer; transition: all 0.2s;
}
.book-card:hover { border-color: var(--accent-color); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.book-number {
    display: inline-block; background: var(--accent-color); color: white;
    padding: 0.2em 0.6em; border-radius: var(--radius-sm); font-size: 0.75em; font-weight: bold;
}
.book-card h3 { margin: var(--spacing-xs) 0; font-size: 1.2em; }
.author { color: var(--text-secondary); font-size: 0.9em; }
.description { margin: var(--spacing-xs) 0; font-size: 0.9em; color: var(--text-secondary); }
.book-tags { display: flex; gap: var(--spacing-xs); flex-wrap: wrap; margin: var(--spacing-xs) 0; }
.tag {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    padding: 0.2em 0.6em; border-radius: 20px; font-size: 0.7em;
}
.book-progress { margin: var(--spacing-sm) 0; }
.book-progress-bar { height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; }
.book-progress-fill { height: 100%; background: var(--success-color); width: 0%; transition: width 0.3s; }
.book-progress-text { font-size: 0.75em; color: var(--text-secondary); }
.book-actions { display: flex; gap: var(--spacing-sm); margin-top: var(--spacing-sm); }

/* ============================================
   BUTTONS
   ============================================ */
.action-btn {
    background: var(--accent-color); color: white; border: none;
    padding: 0.6em 1.2em; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 0.85em; font-weight: 500; transition: all 0.2s; min-height: var(--touch-min);
}
.action-btn:hover { background: var(--accent-hover); transform: scale(1.02); }
.action-btn.primary { background: var(--success-color); }
.action-btn.primary:hover { filter: brightness(1.1); }
.action-btn.small { padding: 0.4em 0.8em; font-size: 0.75em; min-height: auto; }
.action-btn.secondary { background: var(--bg-secondary); color: var(--text-primary); border: 1px solid var(--border-color); }

/* ============================================
   READER CONTENT
   ============================================ */
.reader-mode { padding: 0; max-width: 100%; }
.reader-content-wrapper {
    position: relative; height: calc(100vh - 200px); overflow-y: auto;
    padding: var(--spacing-md); scroll-behavior: smooth;
}
.reader-loading {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    height: 400px; gap: var(--spacing-md); color: var(--text-secondary);
}
.spinner {
    width: 50px; height: 50px; border: 4px solid var(--border-color);
    border-top-color: var(--accent-color); border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.reader-content { line-height: 1.8; }
.reader-error { text-align: center; padding: var(--spacing-xl); color: var(--text-secondary); }

/* Book Text Lines */
.book-text { max-width: 800px; margin: 0 auto; }
.text-line {
    display: flex; gap: var(--spacing-sm); padding: 2px 0;
    transition: background 0.2s; position: relative;
}
.text-line:hover { background: var(--bg-secondary); }
.text-line.marked { background: var(--error-critical-bg); border-left: 3px solid var(--error-critical-border); }
.text-line.error-english { background: var(--error-english-bg); border-left-color: var(--error-english-border); }
.text-line.error-spanish { background: var(--error-spanish-bg); border-left-color: var(--error-spanish-border); }
.text-line.error-typo, .text-line.error-grammar, .text-line.error-logic { background: var(--error-critical-bg); border-left-color: var(--error-critical-border); }
.text-line.mark-note { background: var(--mark-note-bg); border-left-color: var(--mark-note-border); }
.text-line.mark-good { background: var(--mark-good-bg); border-left-color: var(--mark-good-border); }
.text-line.jump-highlight { animation: pulse-highlight 2s ease-out; }
@keyframes pulse-highlight {
    0%, 100% { background: var(--warning-color); }
    50% { background: transparent; }
}

.line-number {
    user-select: none; color: var(--text-secondary); opacity: 0.5;
    min-width: 50px; text-align: right; font-size: 0.7em; font-family: monospace;
}
.line-content { flex: 1; word-break: break-word; }

/* Chapter Headers */
.chapter-header {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    border: 2px solid var(--border-color); border-radius: var(--radius-md);
    padding: var(--spacing-md); margin: var(--spacing-lg) 0 var(--spacing-md);
    scroll-margin-top: 120px;
}
.chapter-title { font-size: 1.3em; color: var(--accent-color); margin-bottom: var(--spacing-xs); }
.chapter-num { font-size: 0.8em; color: var(--text-secondary); }

/* Mark Indicators */
.mark-indicator {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 2px 8px; border-radius: 10px; font-size: 0.65em;
    cursor: help; margin-left: var(--spacing-xs); vertical-align: middle;
}
.mark-indicator.error-critical { background: var(--error-critical-bg); color: var(--error-critical-border); border: 1px solid var(--error-critical-border); }
.mark-indicator.error-english { background: var(--error-english-bg); color: var(--error-english-border); border: 1px solid var(--error-english-border); }
.mark-indicator.error-spanish { background: var(--error-spanish-bg); color: var(--error-spanish-border); border: 1px solid var(--error-spanish-border); }
.mark-indicator.mark-note { background: var(--mark-note-bg); color: var(--mark-note-border); border: 1px solid var(--mark-note-border); }
.mark-indicator.mark-good { background: var(--mark-good-bg); color: var(--mark-good-border); border: 1px solid var(--mark-good-border); }

/* ============================================
   TABLE OF CONTENTS
   ============================================ */
.toc-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6); z-index: 200; display: flex;
    justify-content: flex-end; animation: fadeIn 0.2s;
}
.toc-content {
    background: var(--bg-primary); width: 320px; max-width: 90vw;
    height: 100%; overflow-y: auto; padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
}
.toc-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-md); }
.toc-list { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.toc-item {
    display: flex; align-items: center; gap: var(--spacing-sm);
    background: var(--bg-card); border: 1px solid var(--border-color);
    padding: var(--spacing-sm); border-radius: var(--radius-sm);
    cursor: pointer; text-align: left; transition: all 0.2s;
}
.toc-item:hover { border-color: var(--accent-color); background: var(--bg-secondary); }
.toc-num { background: var(--accent-color); color: white; padding: 0.2em 0.5em; border-radius: 4px; font-size: 0.8em; }
.toc-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 0.85em; }
.toc-line { font-size: 0.7em; color: var(--text-secondary); }

/* ============================================
   SELECTION TOOLBAR
   ============================================ */
.selection-toolbar {
    position: fixed; z-index: 150; background: var(--bg-card);
    border: 2px solid var(--accent-color); border-radius: var(--radius-md);
    padding: var(--spacing-sm); display: flex; gap: var(--spacing-xs);
    box-shadow: var(--shadow-lg); animation: slideUp 0.2s; flex-wrap: wrap;
}
.toolbar-btn {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    padding: 0.4em 0.8em; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 0.75em; white-space: nowrap; transition: all 0.2s;
}
.toolbar-btn:hover { background: var(--accent-color); color: white; }
.toolbar-btn.secondary { opacity: 0.7; }

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6); z-index: 300; display: flex;
    align-items: center; justify-content: center; padding: var(--spacing-md);
    animation: fadeIn 0.2s;
}
.modal {
    background: var(--bg-primary); border-radius: var(--radius-lg);
    padding: var(--spacing-md); width: 100%; max-width: 500px;
    max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg);
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-md); }
.modal-body { margin-bottom: var(--spacing-md); }
.modal-footer { display: flex; gap: var(--spacing-sm); justify-content: flex-end; }
.selected-text-preview {
    background: var(--bg-secondary); border-left: 3px solid var(--accent-color);
    padding: var(--spacing-sm); margin: var(--spacing-sm) 0; font-style: italic;
    max-height: 100px; overflow-y: auto;
}
.close-btn {
    background: none; border: none; font-size: 1.2em; cursor: pointer;
    color: var(--text-secondary); padding: 0.3em;
}
.close-btn:hover { color: var(--accent-color); }

/* ============================================
   ERROR PANEL
   ============================================ */
.error-panel {
    position: fixed; top: 0; right: 0; bottom: 0; width: 350px; max-width: 90vw;
    background: var(--bg-primary); z-index: 250; box-shadow: var(--shadow-lg);
    display: flex; flex-direction: column; animation: slideInRight 0.3s;
}
.error-panel-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: var(--spacing-md); border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}
.error-panel-filters {
    display: flex; flex-wrap: wrap; gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md); border-bottom: 1px solid var(--border-color);
}
.filter-btn {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    padding: 0.3em 0.6em; border-radius: 20px; cursor: pointer;
    font-size: 0.7em; transition: all 0.2s;
}
.filter-btn.active { background: var(--accent-color); color: white; border-color: var(--accent-color); }
.error-list { flex: 1; overflow-y: auto; padding: var(--spacing-sm) var(--spacing-md); }
.error-item {
    display: flex; align-items: center; gap: var(--spacing-sm);
    padding: var(--spacing-sm); border: 1px solid var(--border-color);
    border-radius: var(--radius-sm); margin-bottom: var(--spacing-xs);
    cursor: pointer; transition: all 0.2s; font-size: 0.8em;
}
.error-item:hover { border-color: var(--accent-color); background: var(--bg-secondary); }
.error-type-badge { font-size: 0.9em; }
.error-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.error-line { color: var(--text-secondary); font-size: 0.85em; }
.delete-mark-btn { background: none; border: none; cursor: pointer; font-size: 1em; padding: 0.2em; }
.error-panel-footer {
    padding: var(--spacing-sm) var(--spacing-md); border-top: 1px solid var(--border-color);
    display: flex; gap: var(--spacing-sm);
}

/* ============================================
   REVIEWS
   ============================================ */
.reviews-list { display: flex; flex-direction: column; gap: var(--spacing-md); }
.review-card {
    background: var(--bg-card); border: 2px solid var(--border-color);
    border-radius: var(--radius-md); padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}
.review-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-xs); }
.review-date { font-size: 0.8em; color: var(--text-secondary); }
.review-tags { display: flex; gap: var(--spacing-xs); flex-wrap: wrap; margin-bottom: var(--spacing-xs); }
.review-chapter { font-size: 0.8em; color: var(--text-secondary); margin-bottom: var(--spacing-xs); }
.review-context {
    background: var(--bg-secondary); border-left: 3px solid var(--accent-color);
    padding: var(--spacing-sm); margin: var(--spacing-xs) 0; font-style: italic;
    font-size: 0.9em;
}
.review-text { margin: var(--spacing-xs) 0; white-space: pre-wrap; }
.review-stars { margin-top: var(--spacing-xs); letter-spacing: 4px; }
.review-actions { display: flex; gap: var(--spacing-sm); margin-top: var(--spacing-sm); }

/* ============================================
   FORMS
   ============================================ */
.form-label { display: block; margin: var(--spacing-sm) 0 var(--spacing-xs); font-weight: 500; }
.form-input, .form-textarea {
    width: 100%; padding: 0.7em 1em; background: var(--bg-card);
    border: 2px solid var(--border-color); border-radius: var(--radius-sm);
    color: var(--text-primary); font-size: 0.95em; font-family: inherit;
}
.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--accent-color); }
.form-textarea { resize: vertical; min-height: 80px; }

.tags-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: var(--spacing-xs); }
.tag-btn {
    background: var(--bg-card); border: 2px solid var(--border-color);
    padding: 0.5em; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 0.8em; transition: all 0.2s; min-height: var(--touch-min);
}
.tag-btn.active { background: var(--accent-color); color: white; border-color: var(--accent-color); }
.tag-btn:hover:not(.active) { border-color: var(--accent-color); }

.reading-progress-input { display: flex; align-items: center; gap: var(--spacing-sm); }
.progress-slider { flex: 1; accent-color: var(--accent-color); }
.slider-display { min-width: 40px; text-align: center; font-size: 0.85em; }

.star-rating { display: flex; gap: var(--spacing-xs); }
.star-btn {
    background: none; border: none; font-size: 1.5em; cursor: pointer;
    opacity: 0.3; transition: all 0.2s; padding: 0.2em;
}
.star-btn.active, .star-btn:hover { opacity: 1; transform: scale(1.1); }

.submit-btn {
    width: 100%; background: var(--accent-color); color: white; border: none;
    padding: 0.8em; border-radius: var(--radius-sm); font-size: 1em;
    font-weight: 600; cursor: pointer; margin-top: var(--spacing-md);
    transition: all 0.2s; min-height: var(--touch-min);
}
.submit-btn:hover { background: var(--accent-hover); transform: translateY(-2px); }

/* ============================================
   CONTINUE HINT
   ============================================ */
.continue-hint {
    background: linear-gradient(135deg, var(--accent-color), var(--success-color));
    color: white; padding: var(--spacing-md); border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md); animation: pulse 2s infinite;
}
.continue-hint-detail { font-weight: 500; margin: var(--spacing-xs) 0; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.8; } }

/* ============================================
   SYNC STATUS
   ============================================ */
.sync-status {
    display: flex; align-items: center; gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md); background: var(--bg-secondary);
    border-top: 1px solid var(--border-color); font-size: 0.8em;
}
.sync-dot { width: 10px; height: 10px; border-radius: 50%; background: gray; }
.sync-dot.online { background: var(--success-color); }
.sync-dot.offline { background: var(--warning-color); animation: blink 1s infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
.sync-btn {
    background: none; border: 1px solid var(--border-color);
    padding: 0.3em 0.6em; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 0.8em; margin-left: auto;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    text-align: center; padding: var(--spacing-md); background: var(--bg-secondary);
    border-top: 1px solid var(--border-color); margin-top: auto;
}
.footer-small { font-size: 0.75em; color: var(--text-secondary); margin-top: var(--spacing-xs); }

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast {
    position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: var(--bg-card); color: var(--text-primary); border: 2px solid var(--accent-color);
    padding: 0.8em 1.5em; border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
    z-index: 999; opacity: 0; transition: all 0.3s; font-size: 0.9em;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center; color: var(--text-secondary); padding: var(--spacing-xl);
    background: var(--bg-secondary); border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInRight { from { transform: translateX(100%); } to { transform: translateX(0); } }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 600px) {
    .header h1 { font-size: 1.2em; }
    .book-actions { flex-direction: column; }
    .toc-content { width: 100%; }
    .error-panel { width: 100%; }
    .selection-toolbar { left: 10px; right: 10px; justify-content: center; }
    .modal { margin: var(--spacing-sm); }
    .chapter-nav select { min-width: 100px; font-size: 0.75em; }
    .nav-arrow { padding: 0.3em 0.5em; font-size: 0.65em; }
}

/* ============================================
   PRINT STYLES (for saving)
   ============================================ */
@media print {
    .header, .main-nav, .footer, .sync-status, .selection-toolbar,
    .error-panel, .modal-overlay, .toc-overlay { display: none !important; }
    .reader-mode { padding: 0; }
    .text-line { page-break-inside: avoid; }
    .line-number { color: #666; }
}